Common Contracts

EXHIBIT 4.1 RIGHTS AGREEMENT

Rights Agreement • December 21st, 2001 • Hybridon Inc • Biological products, (no disgnostic substances) • New York

• Contract Type
  Rights Agreement
• Filed
  December 21st, 2001
• Company
  Hybridon Inc
• Industry
  Biological products, (no disgnostic substances)
• Jurisdiction
  New York

and

Rights Agreement • February 25th, 1997 • Mine Safety Appliances Co • Orthopedic, prosthetic & surgical appliances & supplies • Pennsylvania

• Contract Type
  Rights Agreement
• Filed
  February 25th, 1997
• Company
  Mine Safety Appliances Co
• Industry
  Orthopedic, prosthetic & surgical appliances & supplies
• Jurisdiction
  Pennsylvania